Conditions for the Start/Stop function

Updated 2020-03-19

Certain conditions must be met for Start/Stop to function.

If any condition is not met, this will be indicated in the instrument panel.

The engine does not auto-stop

The engine will not auto-stop if:

the vehicle has not reached a speed of ca 10 km/h (6 mph) after starting.
after several auto-stops, the speed must again exceed approximately ca 10 km/h (6 mph) before the next auto-stop.
the driver's seat belt is unbuckled.
the start battery's charge is below the minimum level.
the engine is not running at its normal operating temperature.
the ambient temperature is under approximately -5 °C (23 °F) or over approximately 37 °C (98 °F).
windshield heating is activated.
the climate system settings and the actual climate in the passenger compartment differ.
the vehicle is backing up.
the start battery's temperature is above or below the permitted limits.
the driver is turning the steering wheel hard.
the road gradient is very steep.
the hood is open.
driving at high altitude and the engine has not reached its normal operating temperature.
ABS has been activated.
hard braking (even if the ABS system has not been activated).
many starts during a short period of time have triggered the starter motor's overheating protection.
the exhaust system's particulate filter is full
a trailer is connected to the vehicle's electrical system.

The engine will not auto-start after an auto-stop if:

the driver is not wearing a seat belt, the gear selector is in the P position and the driver's door is open. The engine must be started normally.

In the following situations, the engine will auto-start even if the brake pedal is depressed:

high levels of condensation on the inside of the windows.
the climate system settings and the actual climate in the passenger compartment differ.
electrical current consumption is temporarily high or the start battery's charge is below the minimum level.
the brake pedal is pumped repeatedly.
the hood is open.
the vehicle begins to roll or increases speed slightly if the engine auto-stopped before the vehicle was at a standstill.

the driver's seat belt is unbuckled with the gear selector in the D or N positions.
the gear selector is moved from D to R or M (±).
the driver's door is opened with the gear selector in D. An audible signal and a text message informs the driver that the ignition is on.

Do not open the hood if the engine has auto-stopped. Turn off the engine by switching off the ignition before lifting the hood.